Java Mail(发邮件)

最新推荐文章于 2021-02-27 02:23:44 发布

别等时光非礼了梦想z

最新推荐文章于 2021-02-27 02:23:44 发布

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分类专栏： Java 文章标签： Java Mail 发邮件

本文链接：https://blog.youkuaiyun.com/F_TimeOk/article/details/86001977

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简单邮件发送案例：

import org.junit.Test;

import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.util.Date;
import java.util.Properties;

public class MailTest {
    @Test
    public void sendMail() throws Exception{
        //Session的配置
        Properties prop = new Properties();
        prop.setProperty("mail.debug","true");//开启邮箱debug过程
        prop.setProperty("mail.host", "smtp.qq.com");//邮箱域名
        prop.setProperty("mail.smtp.port","25");//端口
        prop.setProperty("mail.transport.protocol", "smtp");//邮箱协议
        prop.setProperty("mail.smtp.auth", "true");//邮箱认证状态

        //获取session
        Session session = Session.getDefaultInstance(prop, new Authenticator() {
            @Override
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication("邮箱账号","邮箱密码 是开启smtp时候的授权码");
            }
        });
        //创建message对象
        Message message = new MimeMessage(session);
        //指明邮件的发件人 跟上面邮箱认证账号保持一致
        message.setFrom(new InternetAddress("邮箱账号"));
        //指明邮件的收件人 多个收件人逗号隔开
        message.setRecipients(Message.RecipientType.TO, InternetAddress.parse("收件人"));
        //邮件的标题
        message.setSubject("测试发邮件标题");
        //邮件的文本内容
        message.setContent("邮件内容", "text/html;charset=UTF-8");
        //设置信件头的发送日期
        message.setSentDate(new Date());
        //发送邮件 该方法内部关闭了资源，不用手动关闭了
        Transport.send(message);
    }
}

参考一些博客，整理写了一个MailUtil

mail.properties

# 是否开启debug调试
mail.debug=false
# 发送服务器是否需要身份验证
mail.smtp.auth=true
# 邮件发送端口
mail.smtp.port=25
# 邮件服务器主机名
mail.host=
# 发送邮件协议名称
mail.transport.protocol=smtp


# 发送邮件的昵称
mail.nick=测试昵称

# 发送邮件用户名
mail.user=

# 发送邮件邮箱密码此处是授权码
mail.pass=

# 发送邮件发件人
mail.from=

# 发送邮件收件人
mail.to=

MailConfig实体

/**
 * 邮箱配置信息对象
 * @author fdh
 */
public class EmailConfig {
    /**是否开启debug调试*/
    private String debug;
    /**发送服务器是否需要身份验证*/
    private String auth;
    /**发送邮件端口*/
    private String port;
    /**邮件服务器主机名*/
    private String host;
    /**发送邮件协议名称*/
    private String protocol;
    /**发送邮件用户名*/
    private String user;
    /**发送邮件邮箱密码*/
    private String pass;
    /**发送邮件的发件人昵称*/
    private String nick;
    /**发送邮件发件人*/
    private String from;
    /**发送邮件的收件人*/
    private String to;

    public String getDebug() {
        return debug;
    }

    public void setDebug(String debug) {
        this.debug = debug;
    }

    public String getAuth() {
        return auth;
    }

    public void setAuth(String auth) {
        this.auth = auth;
    }

    public String getPort() {
        return port;
    }

    public void setPort(String port) {
        this.port = port;
    }

    public String getHost() {
        return host;
    }

    public void setHost(String host) {
        this.host = host;
    }

    public String getProtocol() {
        return protocol;
    }

    public void setProtocol(String protocol) {
        this.protocol = protocol;
    }

    public String getUser() {
        return user;
    }

    public void setUser(String user) {
        this.user = user;
    }

    public String getPass() {
        return pass;
    }

    public void setPass(String pass) {
        this.pass = pass;
    }

    public String getNick() {
        return nick;
    }

    public void setNick(String nick) {
        this.nick = nick;
    }

    public String getFrom() {
        return from;
    }

    public void setFrom(String from) {
        this.from = from;
    }

    public String getTo() {
        return to;
    }

    public void setTo(String to) {
        this.to = to;
    }
}

MailUtil

import com.dongao.core.base.EmailConfig;
import org.apache.commons.lang3.StringUtils;

import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.mail.*;
import javax.mail.internet.*;
import java.io.File;
import javax.mail.Message.RecipientType;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Date;
import java.util.List;
import java.util.Properties;

/**
 * Mail发送工具类
 *
 * 发件人只能从配置文件中设置
 * smtp协议的方式发送邮件
 *
 * RecipientType类的枚举值，分别有"TO"、"CC"以及"BCC"，分别代表"收件"、"抄送"以及"暗送"
 *
 * @author fdh
 */
public class EmailUtil {
    /**创建session的配置*/
    private static Properties sessionProp;
    /**从配置文件中读取到的配置对象*/
    private static EmailConfig email;
    private static Session session;

    //邮箱设置的几个相关常量
    private static final String MAIL_DEBUG = "mail.debug";
    private static final String MAIL_SMTP_AUTH = "mail.smtp.auth";
    private static final String MAIL_SMTP_PORT = "mail.smtp.port";
    private static final String MAIL_HOST = "mail.host";
    private static final String MAIL_TRANSPORT_PROTOCOL = "mail.transport.protocol";
    /**
     * Session.getInstance();获取配置文件中读取 mail.user 和 mail.pass
     * Session.getDefaultInstance();自己实现认证
     */
    private static final String MAIL_USER = "mail.user";
    private static final String MAIL_PASS = "mail.pass";

    static {
        InputStream is = EmailUtil.class.getClassLoader().getResourceAsStream("config/mail/mail.properties");
        InputStreamReader isr = null;
        try {
            isr = new InputStreamReader(is, "UTF-8");
            sessionProp = new Properties();
            Properties prop = new Properties();
            email = new EmailConfig();
            prop.load(isr);
            //设置邮箱debug模式
            String debug = prop.getProperty("mail.debug");
            if(StringUtils.isNotBlank(debug)){
                email.setDebug(debug.trim());
            }
            //设置邮箱身份验证
            String auth = prop.getProperty("mail.smtp.auth");
            if(StringUtils.isNotBlank(auth)){
                email.setAuth(auth.trim());
            }
            //设置邮箱发送端口
            String port = prop.getProperty("mail.smtp.port");
            if(StringUtils.isNotBlank(auth)){
                email.setPort(port.trim());
            }
            //设置邮件服务器主机名
            String host = prop.getProperty("mail.host");
            if(StringUtils.isNotBlank(host)){
                email.setHost(host.trim());
            }
            //设置邮件协议名称
            String protocol = prop.getProperty("mail.transport.protocol");
            if(StringUtils.isNotBlank(protocol)){
                email.setProtocol(protocol.trim());
            }
            //设置邮箱的用户名
            String user = prop.getProperty("mail.user");
            if(StringUtils.isNotBlank(user)){
                email.setUser(user.trim());
            }
            //设置邮箱的密码
            String pass = prop.getProperty("mail.pass");
            if(StringUtils.isNotBlank(pass)){
                email.setPass(pass.trim());
            }
            //设置邮箱发件人昵称
            String nick = prop.getProperty("mail.nick");
            if(StringUtils.isNotBlank(nick)){
                email.setNick(nick.trim());
            }
            //设置发送邮件的发送人
            String from = prop.getProperty("mail.from");
            if(StringUtils.isNotBlank(from)){
                email.setFrom(from.trim());
            }
            //设置发送邮件的收件人
            String to = prop.getProperty("mail.to");
            if(StringUtils.isNotBlank(to)){
                email.setTo(to.trim());
            }

            sessionProp.setProperty(MAIL_DEBUG,email.getDebug());
            sessionProp.setProperty(MAIL_SMTP_AUTH,email.getAuth());
            sessionProp.setProperty(MAIL_HOST, email.getHost());
            sessionProp.setProperty(MAIL_SMTP_PORT,email.getPort());
            sessionProp.setProperty(MAIL_TRANSPORT_PROTOCOL,email.getProtocol());
            //sessionProp.setProperty(MAIL_USER,email.getUser());
            //sessionProp.setProperty(MAIL_PASS, email.getPass());

            //创建session同时认证邮箱 密码是授权码不是邮箱的密码，类比于第三方客户端登录时候用的密码
            session = Session.getDefaultInstance(sessionProp, new Authenticator() {
                @Override
                protected PasswordAuthentication getPasswordAuthentication() {
                    return new PasswordAuthentication(email.getUser(),email.getPass());
                }
            });
        } catch (Exception e) {
            throw new RuntimeException("邮箱初始化失败:",e);
        }
    }

    /**
     * 校验邮件
     * (校验标题、校验内容非空性)
     *
     * @param subject 邮件标题
     * @param content 邮件正文
     * @param fileList 邮件附件
     * void
     */
    private static void checkEmail(String subject, String content, List<File> fileList){
        if(StringUtils.isEmpty(subject)){
            throw new RuntimeException("邮件标题不能为空!");
        }

        if(StringUtils.isEmpty(content) && (fileList==null || fileList.size()==0)){
            throw new RuntimeException("邮件内容不能为空!");
        }
    }

    /**
     * 构建Message对象
     *
     * @param subject 邮件标题
     * @param content 邮件内容
     * @param to 收件人（多个收件人用英文逗号隔开）
     * @param fileList 附件
     * @return 邮箱对象
     * @throws Exception
     */
    private static Message createMessage(String subject, String content, String to, String nick, List<File> fileList){
        //校验标题正文
        checkEmail(subject, content, fileList);
        //邮件内容
        Message msg = new MimeMessage(session);
        try {
            Multipart mp = createMultipart(content, fileList);
            if(StringUtils.isEmpty(nick)){
                msg.setFrom(new InternetAddress(email.getFrom()));
            }else{
                //编码解决中文乱码
                String nickName = MimeUtility.encodeText(nick,"UTF-8",null);
                msg.setFrom(new InternetAddress(nickName+" <"+email.getFrom()+">"));
            }
            msg.setSubject(subject);
            msg.setRecipients(RecipientType.TO, InternetAddress.parse(to));
            //Multipart加入到信件
            msg.setContent(mp);
            //设置信件头的发送日期
            msg.setSentDate(new Date());
        } catch (Exception e) {
            throw new RuntimeException("构建Message对象异常",e);
        }
        return msg;
    }

    /**
     * 构建附有抄送、暗送Message对象
     *
     * @param subject 邮件标题
     * @param content 邮件内容
     * @param to 收件人（多个收件人用英文逗号隔开）
     * @param cc 抄送人（多个抄送人用英文逗号隔开）
     * @param bcc 暗送人（多个暗送人用英文逗号隔开）
     * @param fileList 附件
     * @return Message对象
     */
    private static Message createMessageCcAndBcc(String subject, String content, String to, String nick, String cc, String bcc, List<File> fileList){
        Message msg = createMessage(subject, content, to, nick, fileList);
        try {
            if(StringUtils.isNotBlank(cc)){
                msg.setRecipients(RecipientType.CC, InternetAddress.parse(cc));
            }
            if(StringUtils.isNotBlank(bcc)){
                msg.setRecipients(RecipientType.BCC, InternetAddress.parse(bcc));
            }
        } catch (Exception e) {
            throw new RuntimeException("构建附有抄送、暗送Message对象异常：",e);
        }

        return msg;
    }

    /**
     * 构建附件对象
     *
     * @param content 邮件正文内容
     * @param fileList 附件
     * @return 邮件内容对象
     * Multipart
     */
    private static Multipart createMultipart(String content, List<File> fileList){
        //邮件内容
        Multipart mp = new MimeMultipart();
        MimeBodyPart mbp = new MimeBodyPart();
        try {
            mbp.setContent(content, "text/html;charset=UTF-8");
            mp.addBodyPart(mbp);

            if(fileList!=null && fileList.size()>0){
                //附件
                FileDataSource fds;
                for(File file : fileList){
                    mbp=new MimeBodyPart();
                    //得到数据源
                    fds = new FileDataSource(file);
                    //得到附件本身并至入BodyPart
                    mbp.setDataHandler(new DataHandler(fds));
                    //设置文件名到BodyPart
                    mbp.setFileName(MimeUtility.encodeText(file.getName(),"UTF-8",null));
                    mp.addBodyPart(mbp);
                }
            }
        } catch (Exception e) {
            throw new RuntimeException("构建附件对象异常",e);
        }
        return mp;
    }

    /**
     * 通用发送邮件
     *
     * @param subject 邮件标题
     * @param content 邮件内容
     * @param to 收件人（多个收件人用英文逗号隔开）
     */
    public static void sendEmail(String subject, String content, String to, String nick, String cc, String bcc, List<File> fileList){
        if(StringUtils.isEmpty(to)){
            to = email.getTo();
        }
        Message msg = createMessageCcAndBcc(subject, content, to, nick, cc, bcc, fileList);
        try {
            Transport.send(msg);
        } catch (MessagingException e) {
            throw new RuntimeException("通用发送邮件异常：",e);
        }
    }

    /**
     * 发送邮件
     *
     * @param subject 邮件标题
     * @param content 邮件内容
     * @param to 收件人（多个收件人用英文逗号隔开）
     */
    public static void sendEmail(String subject,String content,String to){
        if(StringUtils.isEmpty(to)){
            to = email.getTo();
        }
        Message msg = createMessage(subject, content, to, email.getNick(),null);
        try {
            Transport.send(msg);
        } catch (MessagingException e) {
            throw new RuntimeException("发送邮件异常：",e);
        }
    }


    /**
     * 发送带有昵称的邮件
     *
     * @param subject 邮件标题
     * @param content 邮件内容
     * @param to 收件人（多个收件人用英文逗号隔开）
     * @param nick 发件人昵称 (优先级 入参 > 配置文件)
     */
    public static void sendEmailWithNick(String subject,String content,String to,String nick){
        if(StringUtils.isEmpty(to)){
            to = email.getTo();
        }
        Message msg = createMessage(subject, content, to, nick,null);
        try {
            Transport.send(msg);
        } catch (MessagingException e) {
            throw new RuntimeException("发送带有昵称的邮件异常：",e);
        }
    }

    /**
     * 发送带有附件的邮件
     *
     * @param subject 邮件标题
     * @param content 邮件内容
     * @param to 收件人（多个收件人用英文逗号隔开）
     * @param fileList 附件
     */
    public static void sendEmailWithAttachment(String subject,String content,String to,List<File> fileList){
        if(StringUtils.isEmpty(to)){
            to = email.getTo();
        }
        Message msg = createMessage(subject, content, to,email.getNick(), fileList);
        try {
            Transport.send(msg);
        } catch (MessagingException e) {
            throw new RuntimeException("发送带有附件的邮件异常：",e);
        }
    }

    /**
     * 发送带有抄送人的邮件
     *
     * @param subject 邮件标题
     * @param content 邮件内容
     * @param to 收件人（多个收件人用英文逗号隔开）
     * @param cc 抄送人（多个收件人用英文逗号隔开）
     * @param fileList 附件
     */
    public static void sendEmailWithCc(String subject, String content, String to, String cc, List<File> fileList){
        if(StringUtils.isEmpty(to)){
            to = email.getTo();
        }
        Message msg = createMessageCcAndBcc(subject, content, to, email.getNick(), cc, null, fileList);
        try {
            Transport.send(msg);
        } catch (MessagingException e) {
            throw new RuntimeException("发送带有昵称和附件的邮件异常：",e);
        }
    }

    /**
     * 发送带有暗送人的邮件
     *
     * @param subject 邮件标题
     * @param content 邮件内容
     * @param to 收件人（多个收件人用英文逗号隔开）
     * @param bcc 暗送人（多个收件人用英文逗号隔开）
     * @param fileList 附件
     */
    public static void sendEmailWithBcc(String subject, String content, String to, String bcc, List<File> fileList){
        if(StringUtils.isEmpty(to)){
            to = email.getTo();
        }
        Message msg = createMessageCcAndBcc(subject, content, to, email.getNick(), null, bcc, fileList);
        try {
            Transport.send(msg);
        } catch (MessagingException e) {
            throw new RuntimeException("发送带有暗送人的邮件异常：",e);
        }
    }
}